Wow. I was reading through just a few pages of this Harry Potter section and found all of these...
http://hp.adult-fanfiction.org/story.php?no=600018586
http://hp.adult-fanfiction.org/story.php?no=600017381
http://hp.adult-fanfiction.org/story.php?no=600017270
http://hp.adult-fanfiction.org/story.php?no=600017265
http://hp.adult-fanfiction.org/story.php?no=600017112
http://hp.adult-fanfiction.org/story.php?no=600017054
http://hp.adult-fanfiction.org/story.php?no=600017059
http://hp.adult-fanfiction.org/story.php?no=600017046
http://hp.adult-fanfiction.org/story.php?no=600016990
http://hp.adult-fanfiction.org/story.php?no=600015843
http://hp.adult-fanfiction.org/story.php?no=600015810
http://hp.adult-fanfiction.org/story.php?no=600015810
http://hp.adult-fanfiction.org/story.php?no=600015699
http://hp.adult-fanfiction.org/story.php?no=600015537
http://hp.adult-fanfiction.org/story.php?no=600015437
http://hp.adult-fanfiction.org/story.php?no=600015246
http://hp.adult-fanfiction.org/story.php?no=600015171
http://hp.adult-fanfiction.org/story.php?no=600015158